Maddie sends in a question which leads James Tytko and Cambridge astrophysicist Xander Byrne on a mission to the centre of Jupiter and Saturn...

James - The largest planets in our solar system, Jupiter and Saturn, have outer layers made of gas. Hence, we call them gas giants. But as we're about to find out, dive beneath the surface and the plot thickens. Here to guide us on our journey to the root of the question is Cambridge University astrophysicist Xander Byrne.